Exercise 11: Skeletal Muscle Origins+Insertions

Question 1

Masseter (elevates mandible)

Answer 1

Origin- zygomatic arch

Insertion- angle of mandible

Question 2

Sternocleidomastoid

Neck flexion, head rotation

Answer 2

Origin-manubrium, medial clavicle

Insertion- mastoid process

Question 3

Pectoralis Minor

Pulls scapula forward+inferior

Answer 3

Origin- ribs 3-5

Insertion- coracoid process

Question 4

Deltoid

Arm abduction/rotation

Answer 4

Origin- lateral clavicle, acromion+spine of scapula

Insertion- deltoid tuberosity (humerus)

Question 5

Biceps Brachii

Supination of forearm, flexion of elbow

Answer 5

Origin- coracoid process(short head)
margin of glenoid cavity(long head)

Insertion- radial tuberosity

Question 6

Rectus Abdominis
(Flexion of lumbar vertbral column)

Answer 6

Origin- pubis

Insertion- xiphoid process, costal cartilages 5-7

Question 7

Adductor Longus

Adducts thigh

Answer 7

Origin- pubis

Insertion-linea aspera (femur)

Question 8

Adductor Magnus

Adducts thigh

Answer 8

Origin- pubis+ischial tuberosity

Insertion- linea aspera

Question 9

Biceps Femoris

Flexes knees, extends thigh

Answer 9

Origin- ischial tuberosity+ linea aspera

Insertion- head of fibula, lateral condyle(tibia)

Question 10

Rectus Femoris

Extends knee

Answer 10

Origin-anterior interior iliac spine, margin of acetabulum

Insertion- tibial tuberosity, patella

Question 11

Vastus Lateralis

Extends knee

Answer 11

Origin- greater trochanter+ linea aspera

Insertion- tibial tuberosity, patella

Question 12

Vastus Medialias

Extends knee

Answer 12

Origin- linea aspera

Insertion- tibial tuberosity, patella

Question 13

Fibularis Longus

Plantar flexion, foot eversion

Answer 13

Origin- head+lateral surface of fibula

Insertion- medial cuneiform, metatarsal 1

Question 14

Gastronemius

Plantar flexion

Answer 14

Origin- condyle of femur

Insertion- calcaneus